Criminals are increasingly exploiting a critical hole in the Java Runtime Environment (JRE) to infect computers with malicious code when users visit a specially crafted web page. According to well-known security blogger Brian Krebs, the reason for this increased activity is that the arsenal of the BlackHole exploit kit has been extended to include a suitable exploit.

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You don't need to be a genius to debug a pf.conf firewall ruleset, you just need the guts to run tcpdump